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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 2,399,051 $ 2,244,926
Total Other Comprehensive Income (Loss) (4,768) 1,694
Ending balance 2,404,730 2,264,802
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (62,840) (66,048)
Amounts reclassified from AOCI (pre-tax) (6,949) (1,732)
Income tax impact of amounts reclassified 1,765 440
Other OCI changes (pre-tax) 558 4,002
Income tax impact of other OCI changes (142) (1,016)
Total Other Comprehensive Income (Loss) (4,768) 1,694
Ending balance (67,608) (64,354)
Fair Value Adjustment for Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 3,665 8,287
Amounts reclassified from AOCI (pre-tax) 2,745 (2,224)
Income tax impact of amounts reclassified (697) 565
Other OCI changes (pre-tax) 67 (168)
Income tax impact of other OCI changes (17) 43
Total Other Comprehensive Income (Loss) 2,098 (1,784)
Ending balance 5,763 6,503
PNM    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 2,000,775 1,960,324
Total Other Comprehensive Income (Loss) (6,866) 3,478
Ending balance 2,034,870 2,017,995
PNM | Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (66,505) (74,335)
Amounts reclassified from AOCI (pre-tax) (9,694) 492
Income tax impact of amounts reclassified 2,462 (125)
Other OCI changes (pre-tax) 491 4,170
Income tax impact of other OCI changes (125) (1,059)
Total Other Comprehensive Income (Loss) (6,866) 3,478
Ending balance (73,371) (70,857)
PNM | Unrealized Gains on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 10,652 7,422
Amounts reclassified from AOCI (pre-tax) (10,910) (702)
Income tax impact of amounts reclassified 2,771 178
Other OCI changes (pre-tax) 491 4,170
Income tax impact of other OCI changes (125) (1,059)
Total Other Comprehensive Income (Loss) (7,773) 2,587
Ending balance 2,879 10,009
PNM | Pension Liability Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (77,157) (81,757)
Amounts reclassified from AOCI (pre-tax) 1,216 1,194
Income tax impact of amounts reclassified (309) (303)
Other OCI changes (pre-tax) 0 0
Income tax impact of other OCI changes 0 0
Total Other Comprehensive Income (Loss) 907 891
Ending balance $ (76,250) $ (80,866)